江海交汇环境桥梁高性能混凝土耐久性研究现状与探讨

Research progress and discussion on durability of bridges high performance concrete under the intersection environment of river and sea

综述了目前国内外混凝土耐久性的研究进展和河口水域环境下的混凝土耐久性的研究现状,从实际工程应用的角度,提出工程需求,建议针对河口水域枯季氯盐含量较高、洪季盐/淡水强烈混合和桥位水域水位变化明显的特点,开展江海交汇环境氯盐、硫酸盐作用下混凝土耐久性失效状况研究,明确混凝土原材料指标,优化、完善配合比设计;采用科学的手段,评估类似桥梁所用高性能结构混凝土抗氯离子渗蚀及硫酸盐侵蚀的性能。

Reviewed the research progress on durability of concrete and estuafine water environment and gave a few suggestions from the perspective of practical application.The estuarine water contained high chloride in dry season, and the salt/fresh water mixed strongly in flood season with the water level changed significantly.So it was important to conduct the study of resistance of concrete to chloride and sulfate attack under the intersection environment of river and sea.It was worth to clear the indicators of concrete materials, optimize and improve the mix design.The test and verify were also needed to control the concrete properties in the construction period.